newbie question: boe-bot turns and dead reckoning

the nerge

I'm building my first Boe-Bot and am having a problem with the left turn 90 degrees /right turn 90 degrees. The first turn will be 90 degrees but each successive turn will be a random degree amount. I tried changing the batteries, putting the boe-bot on a difference surface, but those things didn't help. I went ahead and tried to do a dead reckoning routine just to see what would happen, with similar result: boe-bot gets more erratic with each subroutine. Any ideas? Thanks!

dandreae

Can you attach your code as a .bs2 file?

Dave

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Dave Andreae

Parallax Tech Support·

the nerge

Hi Dave,

Code is attached. Thanks!

dandreae

Try these codes and see if it makes a difference (attached).

Dave

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Dave Andreae

Parallax Tech Support

C-Bob

Maybe, trouble is in "servo pulse" timming, you must calculate machine time between servo control pulses and change lenght of pauses. Trivial programs havent this problem, but, if you write more complex code, you must calculate with this. Your code is only fragment and appears OK. Wrong lenght of pause (long) make boe-boot noisy, moving jerky - randomly. This is nice show, if you use photoresistors in darkness.

the nerge

Dave, these programs have the same result, which is that I can't get the boe-bot to turn at a consistent angle. Each time I run the program it performs differently.

C-Bob, by pauses, do you mean the PAUSE value or the PULSOUT, or something else? I've tried modifying the the pulseCount variable.

Thanks!

Post Edited (the nerge) : 10/7/2009 2:55:59 AM GMT